Co Nanoparticles Induced Resistive Switching and Magnetism for the Electrochemically Deposited Polypyrrole Composite Films

Abstract

The resistive switching behavior of Co-nanoparticle-dispersed polypyrrole (PPy) composite films is studied. A novel design method for resistive random access memory (ReRAM) is proposed. The conducting polymer films with metal nanocrystal (NC)-dispersed carbon chains induce the spontaneous oxidization of the conducting polymer at the surface. The resistive switching behavior is achieved by an electric field controlling the oxygen ion mobility between the metal electrode and the conducting polymer film to realize the mutual transition between intrinsic conduction (low resistive state) and oxidized layer conduction (high resistive state). Furthermore, the formation process of intrinsic conductive paths can be effectively controlled in the conducting polymer ReRAM using metal NCs in films because the inner metal NCs induce electric field lines converging around them and the intensity of the electric field at the tip of NCs can greatly exceed that of the other region. Metal NCs can also bring new characteristics for ReRAM, such as magnetism by dispersing magnetic metal NCs in polymer, to obtain multifunctional electronic devices or meet some special purpose in future applications. Our works will enrich the application fields of the electromagnetic PPy composite films and present a novel material for ReRAM devices.

The effect of annealing temperature on resistive switching behaviors of HfOx film

“…The conduction behavior of the LRS is not Ohmic conduction, proving the homogenously distributed Fig. 6 The I-V plots of the prepared HfO x samples in log-log scale J Mater Sci: Mater Electron filaments rather than a confined filamentary effect in the film [21]. This may explains the scattered distribution of switching voltages for the 400°C and the 550°C annealed samples.…”

Nanoscale mechanical control of surface electrical properties of manganite films with magnetic nanoparticles

“…In this respect, nanoparticles (NPs) constitute a model system as they not only improve mechanical properties, 37 but also may provide enhanced functionalities such as novel magnetotransport phenomena 38 or optoelectronic capabilities, 39,40 and they could serve as novel magnetic tunnel junctions 41,42 or memory devices. 43 Here we investigate the local mechanical control of the surface electrical properties of a heterostructure consisting of a manganite lm with magnetic FeO x NPs. The AFM tip is used to generate a local stress by rubbing the sample surface, and the resulting changes in local conductivity and electrical surface potential are subsequently measured by conductive AFM (C-AFM) and Kelvin probe force microscopy (KPFM), respectively.…”

Studies on Conduction Mechanism, Magnetization and Electrochemical Properties of Polythiophene-Cobalt Nanocomposites

“…Thermal conductivity increased in nickel doped polypyrrole composites [13]. Incorporation of cobalt in polypyrrole exhibited resistive switching and magnetism [14] and showed utility in the application of electromagnetic wave absorption [15]. Of the three prominent ferromagnetic metals, cobalt has always been considered to be special as it has high saturation magnetization and Curie temperature [16].…”